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1 results

  • Bayes Modal Estimation in Item Response Models

  • Robert J. Mislevy
  • Journal:
    Psychometrika / Volume 51 / Issue 2 / June 1986
    Published online by Cambridge University Press:
    01 January 2025, pp. 177-195

  • This article describes a Bayesian framework for estimation in item response models, with two-stage prior distributions on both item and examinee populations. Strategies for point and interval estimation are discussed, and a general procedure based on the EM algorithm is presented. Details are given for implementation under one-, two-, and three-parameter binary logistic IRT models. Novel features include minimally restrictive assumptions about examinee distributions and the exploitation of dependence among item parameters in a population of interest. Improved estimation in a moderately small sample is demonstrated with simulated data.